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13-8 MO(UNS S13800)

Stainless steels are sometimes referred to as high-alloy steels. These steels exhibit superior corrosion resistance in comparison to other steels due to their higher chromium content. Stainless steels are classified into three groups according to their crystalline structure. These are the martensitic, austenitic, and ferritic groups.

Precipitation-hardened steels are a fourth class of stainless steels comprised of martensitic and ferritic steels. Stainless steel grade 13-8 is a precipitation hardenable stainless steel. This steel exhibits excellent resistance to stress and general corrosion cracking, as well as high transverse toughness and strength, all of which are achieved through a single low temperature heat treatment. The following datasheet discusses stainless steel grade 13-8 in detail.

Chemical Analysis :

Element Content (%)
Iron, Fe 76
Chromium, Cr 12.25-13.25
Nickel, Ni 7.50-8.50
Molybdenum, Mo 2.0-2.50
Aluminum, Al 0.90-1.35
Manganese, Mn 0.10
Silicon, Si 0.10
Carbon, C 0.050
Nitrogen, N 0.010
Phosphorous, P 0.010

Physical Properties :

Properties Metric Imperial
Density 7.80 g/cm3 0.282 lb/in³

Mechanical Properties:

Properties Metric Imperia
Tensile strength 1620 MPa 235000 psi
Yield strength (@strain 0.200%) 1480 MPa 215000 psi
Elastic modulus 203 GPa 29443 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation at break (In 50 mm) 12.00% 12.00%
Charpy Impact 27.0 J 19.9 ft-lb
Machinability (35-40 average, based on 100 machinability for AISI 1212 steel) 35.0-40.0 35.0-40.0


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  • Metal working
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